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6 For free is an informal phrase used to mean "without cost or payment." These professionals were giving their time for free. The phrase is correct; you should not use it where you are supposed to only use a formal sentence, but that doesn't make a phrase not correct.
If so, my analysis amounts to a rule in search of actual usage—a prescription rather than a description. In any event, the impressive rise of "free of" against "free from" over the past years suggests that the English-speaking world has become more receptive to using "free of" in place of "free from" during that period.